I read about a devotee who felt deceived by Baba after inviting him to a meal. Can you explain what happened in that story?

You are likely referring to the story of the devotee Dev and his Udyapan ceremony. As detailed in Chapter 40, Dev invited Baba, who promised to come with two others. However, Dev was left feeling disappointed and as though Baba had deceived him when he did not appear in a recognizable form. He even wrote a letter of complaint. In truth, Baba had kept his word perfectly. He appeared in the form of a Sanyasi, accompanied by two other men, and they were served a complete meal. Baba later explained to Jog, "He says I deceived him with My words of assurance; tell him, 'You did not recognize Me! Why then did you call Me?'" The devotee's own delusion and expectations prevented him from recognizing Baba's divine presence.